24 with 525 or 600
 

Rick have you guys rigged one with that much HP yet?
What speeds would it run low 80s to low 90s?

Re: 24 with 525 or 600
 

Their Is An Older 24 With A 598 / Bravo And A Herring Running Over 100

Re: 24 with 525 or 600
 

Isn't that the owner of Activator's boat?????

Re: 24 with 525 or 600
 

I remember speaking with JC about power in the 24' a couple of years back when I was rebuilding the 502MagMPI for my boat.
He told me that he did have people ask to rig boats with 500s and turned them down. To my knowledge a 415HP/502Mag is about the biggest a 24' Super has left the factory with.
As for how much power to run in the low 80s? About 500HP...
To crack 90mph would take a lot more, probably as much as a 30', 700HP???

Re: 24 with 525 or 600
 

I met a guy late this summer. 598ci in an older 24'. He did not have it dialed in yet but seen #'s in the upper 80's. He said he was happy with the motor performance.From what I remember him telling me was dyno in the upper-mid 6's. No tripple dig's on the GSB.

Re: 24 with 525 or 600
 

Years ago I had a 24 Superboat with a Gale Banks twin turbo big block. We never dyno'd it but it was probably making 700+ hp (14 lbs boost) It would bury the Nordskog 80 mph speedo. (long before GPS) the last prop we had on her was a 29p Mirage @ 6300 rpm. Man, what a wild ride, but lots of fun and it was quite a sleeper (turbo's take the bark out of the exhaust) I sold it to a guy from Winnipesaukee back in 1995 and he still has it.

Kurt

Re: 24 with 525 or 600
 

Turbo always scars me a little around here with the salt water and salty air. I think pat's formula is about correct 500 HP low 80's if it is dialed in correctly. (( I noticed alot of diffrence between radar lately, GPS and spedo reading in some of the boat magazines I read - the diffrence can be as much as 7mph )) I would rather one source, one reading, so boater don't throw out #'s all the time like we were stock brokers or bankers. I personally like GPS because you can recall the speed but GPS owner very rarely calibrate there GPS where they buy them. GPS need to be calibrated to you specific elevation, your model gps may have been built in CA at one elevation 500 above sea level and you live in New Orleans below sea level this give an inaccurate reading on GPS MPH.

Re: 24 with 525 or 600
 

I would say Pat is right on....from what all the previous owners have told me and seen on GPS, 500hp will get you into the low 80's...and this is with a non-step, talk to Dave M ...his Step bottom with a 496HO is JUST shy of 80 at 79.x I believe. I also agree with JC....I am not too proud to admit it but I am still learning the limits of my boat and still can give me a wake up call at times....it is the mid range acceleration and torque of the motor that can make things interesting at 60+ :D

Re: 24 with 525 or 600
 

I few years back I corresponded with a fellow, Gary in Albany.
Gary had a 1995 24' Super that he had purchased new.
The original power was a 350HP/454Mag carb'd engine.
The boat ran 73-74mph GPS at 5000rpm spinning a 3 blade 25p Mirage.
Gary pulled the engine and had it dyno'd and it made around 400HP at 5000rpm.
Then he had the engine worked over, ported heads, roller cam, new intake, carb, ignition, exhaust, and...
After some $5000 in mods, back on the dyno; she made 498HP at 5600rpm.
He said with the same 3 blade prop she ran 81-82mph GPS at 5600rpm.
Cracking the 80mph mark was confirmed by the next owner of the boat here on OSO as well... :D

Now to go over 90 I'm not sure how much power?
I will say that these hulls do seem to hit a wall around 80.

It has also been discussed over on the Pantera forum
about power in the 24'. Lots of guys say that with 500HP a 24' Pantera runs high 70s and touchs 80. Jo at Pantera says that he has rigged 24s with HP500s and they run 82mph.

I have boated a number of times with T-Mone here on OSO. He has a 24' Pantera with a 502cube that dyno'd over 600HP and estimates she makes 575HP in the boat. His boat runs 80mph all day long with a 5 blade and not much more than 82mph with a labbed 3 blade.

Re: 24 with 525 or 600
 

Not to pick on you or anything, but this is the second thread I've seen that you talk about GPS calibration. I have recently purchased a Garmin hand held unit. Not only does it say nothing about calibration in the owner's manual, I have been through all of the settings in the machine. There is absolutely no setting for calibrating the unit.

Also, thinking about it, why would you need to calibrate a gps for elevation? A gps is designed to tell you your elevation no matter where you are on earth. It works by finding satellites in the sky and triangulating your position based on those. They don't care what elevation you are at. It only matters what elevation they are at to do the triangulation. A gps functions based on objects in space, not objects on the ground at any elevation. Having to calibrate one doesn't make sense to me.

As I said, I'm not meaning to bash, but I think you are spreading some misinformation.

Re: 24 with 525 or 600
 

Boat sounds familiar :D

Re: 24 with 525 or 600
 

How's she running?
When are you going to come play on the CT river with us?

Re: 24 with 525 or 600
 

I am making the Oct run next year come hell or high water....I drive back and forth on the weekends all summer up to the 1000 islands but I am thinking that June might be a good month to keep the boat down this way as it is still pretty cold up that way. Looking into places to keep it for a month or two next june!

Re: 24 with 525 or 600
 

We start boating in the CT River the first weekend in May.
There are two marina's in Chester that let you store on your trailer and use their ramp. That is what I do...

Re: 24 with 525 or 600
 

JAYHAWK: Not to pick: GPS accuracy: GPS is nice and precise until you get down to scales under 50'. GPS time and frequency reference tool.How do you calibrate a barometer in my GPS? What you are actually calibrating when you want to view the correct elevation or normalized/barometric pressure is the alitmeter,The barometer is simply a sensor that determines the ambient air pressure, or the pressure around you. Once a pressure reading has been obtained, you can calibrate the GPS altimeter based on either a known elevation or the barometric/normalized pressure. "GPS GARMIN ETREX HAND HELD"

Please read this in detail: Takes 1 hour to dial in for an aprox: average and accuracy of a GPS fluxuates and is not exact. One GPS can be off mult MPH from another unit.

http://gpsinformation.net/main/etrexsum.htm

Re: 24 with 525 or 600
 

Super Air, My etrex doesn't need to be calibrated. As is states in the link you postede. The etrex " SUMMIT" is the model that needs calibration. I've used my unit many many times against other GPS's. In dash units and hand helds. All were the same reading as mine.

Re: 24 with 525 or 600
 

The point is GPS is not precise - anyone that understands how it was designed and what they want the public to use it for can realise. GPS can and sometimes are diffrent from unit to unit. Speeds, marking etc.

Re: 24 with 525 or 600
 

The step bottom should run mid 80s with a 525 and low 90s with a 600 right?

Re: 24 with 525 or 600
 

Johnny, the #s between the 525 and the 600 should be about 3-4 mphs at best.

Re: 24 with 525 or 600
 

FF2 not to step on your thread but here is another thing to think about. I think both Dave M and T-Islands have mentioned that the 496 is pretty tight in height...wouldnt you run into a height problem with the 600 withouth hatch mods? What about the 525 w/exhaust? Gary had plans of throwing a 177 blower on top of my motor too but didn't want to cut/modify the hatch...not to mention the thing screams without it! I might be refreshing my motor next winter just to make sure all is well and the fact that the builder hasn't seen the motor in a while from the boat being out of state....still don't think I would go over 500hp. I will admit cruising at 55 at 3250 rpms is REALLY nice...it is really an unbelieveable motor.

Re: 24 with 525 or 600
 

As far as GPS calibration..... :confused: I ran in a radar run back in Oct and the radar was within .2 mph of what my gps read. My GPS speedo and handheld GPS both read the same.

Oh, and I think a 24 with a 500HP (470 HP) would run a consistant 80+. Maybe 82-83 on occasion.

Re: 24 with 525 or 600
 

my friend has a 79 24 with about 550hp only runs 74 it starts chine walking when he trims out its old bottom paint MOST OF IT GONE and trs drive, will a sp master 2 fit? and no hdy steering he has that drew marine stabilizer :eek: and no indicators for trim or k planes :rolleyes: . I TELL HIM I LOOK AT MINE :D when I drive.

Re: 24 with 525 or 600
 

YES, 500HP MAYBE BREAK 80MPH on a 24' if it is dialed in correctly, correct prop and no hooks in the hull. (( I have found 1 props works best on my 24' 4 blade hydromotive was the best with the TRS Big Block )) Tried over 20+ props and the 4 blade hydromotive, labbed was the best !!!! GOT TOP END, MID RANGE AND STABILITY.

Re: 24 with 525 or 600
 

HI what yr and power do you have, my bud has my old mirage 25 turning 5400 about 74. does anyone know if a speed master 2 lower will fit the trs, or a nose cone for the trs if that would help him. get more speed, is there a high speed bottom paint out?

Re: 24 with 525 or 600
 

i rigged an older 24 with a 700+ hp 454, and she ran in the mid 90's 94 or so. had a 24 pitch 4 bld, but the engine turned 7000 r's.





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